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Experimental and th...
Experimental and theoretical lifetimes and transition probabilities for spectral lines in Nb II
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- Nilsson, H. (author)
- Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden
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- Engström, L. (author)
- Department of Physics, Lund University, Box 118, 22100 Lund, Sweden
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- Lundberg, H. (author)
- Department of Physics, Lund University, Box 118, 22100 Lund, Sweden
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- Hartman, H. (author)
- Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM),Lund Observatory, Lund University, Box 43, 22100 Lund, Sweden
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- Palmeri, P. (author)
- Physique Atomique et Astrophysique, Université de Mons, 7000 Mons, Belgium
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- Quinet, P. (author)
- Physique Atomique et Astrophysique, Université de Mons, 7000 Mons, Belgium; IPNAS, Université de Liège, 4000 Liège, Belgium
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(creator_code:org_t)
- 2019-07-08
- 2019
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 627
- Related links:
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https://doi.org/10.1...
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Abstract
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- Aims. We have measured and calculated lifetimes of high lying levels in Nb II, and derived absolute transition probabilities by combining the lifetimes with experimental branching fractions. Methods. The lifetimes were measured using time-resolved laser-induced fluorescence in a two-photon and two-step excitation scheme. The branching fractions were measured in intensity calibrated spectra from a hollow cathode discharge, recorded with a Fourier transform spectrometer. The calculations were performed with the relativistic Hartree-Fock method including core polarization. Results. We report experimental lifetimes of 13 levels in the 4d(3)(F-4)5d and 4d(3)(F-4)6s subconfigurations, at an energy around 70 000 cm(-1). By combining the lifetimes with experimental branching fractions absolute transition probabilities of 59 lines are derived. The experimental results are compared with calculated values.
Keyword
- atomic data
- methods: laboratory: atomic
- techniques: spectroscopic
Publication and Content Type
- ref (subject category)
- art (subject category)
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